This video features Sandy Munro and electric motor expert Paul from Munro & Associates, presenting a teardown and analysis of Volkswagen's new electric drive system. They express significant admiration for the unit, highlighting its substantial improvements in torque (560 Nm) and power (210 kW) over its predecessor, all while fitting into the same physical package. The core focus of the new design is enhanced efficiency, achieved through meticulous engineering. Key praises include the motor's precision-balanced stator windings (exactly 10.0 mOhms per phase), a highly efficient and low-friction gearbox with an innovative pump-less oil lubrication system, and the use of stronger, skewed magnets in the rotor for quiet operation and high torque. The hybrid water and oil cooling system for the motor is also noted. While the motor and gearbox receive high acclaim for their "German engineering at its best" and backward compatibility, the inverter assembly is criticized for its excessive use of threaded fasteners. The system is recognized as a truly European-sourced product, poised to significantly boost VW's competitiveness in the EV market.
Unveiling Volkswagen's Impressive New Electric Drive System
0:00:07 Introduction to VW's New Electric Drive: Sandy Munro and Paul introduce Volkswagen's new electric drive system, loaned for a teardown and analysis.
0:01:15 Major Performance Leap: The new motor boasts 560 Nm of torque (up from 310 Nm) and 210 kW of power (up from 150 kW), fitting into the same package as the previous generation. The primary goal was improved efficiency for better range or smaller batteries.
0:02:59 Second Best on the Planet: Sandy Munro ranks this motor as the second-best globally (after Lucid's, which is not mass-market), predicting a significant positive impact for VW.
0:03:44 Ford Lightning Similarities & VW's Efficiency Strategy: The motor shares similarities in stator winding, size, and power with the Ford Lightning. VW deliberately chose a larger, slower-spinning motor for higher overall system efficiency. The hairpin winding uniformity is praised for durability.
0:05:06 Unprecedented Winding Precision: Resistance measurements show a perfect 10.0 milliohms across all three phases, indicating exceptional manufacturing quality and design execution.
0:07:58 Advanced Cooling System: The system employs a hybrid cooling approach: water cooling for the stator's exterior and oil spray for the interior. The stator housing requires high-precision machining for its freeze-fit assembly.
0:10:47 Optimized Gearbox and Low Friction: The new 9.8:1 gear ratio (down from 13:1) allows the motor to spin slower, boosting efficiency. The gearbox exhibits extremely low friction, likened to a "Swiss watch," with optimized bearings and gear finishing.
0:12:45 Innovative Pump-less Lubrication: The gearbox utilizes a clever pump-less oil lubrication system where a gear slings oil into a reservoir with engineered channels, a design reminiscent of early Henry Ford engines. The lay shaft is positioned higher to avoid oil churning.
0:16:18 Friction as a Key to Efficiency: The presenters emphasize that reducing friction, as seen in this gearbox, is as critical as battery size for achieving good range.
0:17:29 Rotor Design for Quiet Power: The 8-pole, 48-slot rotor features skewed magnets in four steps, a technique to reduce acoustic noise by spreading out the force pulses on the stator teeth.
0:20:40 Stronger Magnets for Torque and Efficiency: VW opted for stronger magnets (likely Neodymium) to deliver high torque and improve efficiency, especially at lighter loads, contributing to a quieter and more responsive driving experience.
0:22:38 Stator Craftsmanship and 800V Upgrade Path: The stator's freeze-fit assembly into the housing underscores the need for tight tolerances and statistical process control. Its four-parallel-path design offers an easy upgrade to an 800-volt system by simply reconfiguring connections.
0:24:46 Backward Compatibility Advantage: The new drive unit's ability to fit into the same package as the old one offers significant savings in integration costs for VW.
0:25:56 Inverter Integration and Critique: While the inverter is better integrated into the drive unit housing than previous designs, with automatic fluid connections, its assembly is heavily criticized for an excessive number of threaded fasteners on its "spider frame" and circuit board.
0:30:15 Inverter Electronics & Sourcing: The inverter board features some innovation with planar transformers and an Infineon chip. Competition has likely driven down Infineon's prices.
0:33:41 A "True European Motor": The components are sourced extensively from across Europe (Germany, Hungary, Italy, Czech Republic, Turkey), highlighting European manufacturing capability.
0:34:48 High Praise and Future Implications: The presenters are deeply impressed, suggesting this motor could revitalize VW's EV efforts and is a benchmark for engineering excellence within the company.